Hey all,
I have a quick question. It has been my understanding that 0.67 prism diopters is the Horizontal imbalance tolerance (as long as < 2.75 D), whether it is 0.67 in one eye, or any combination in the two lenses together, as long as it is not over 0.67 TOTAL
I was discussing with an instructor, and they claim that the tolerance is 0.33 horizontal prism MAX EACH eye, up to a total of 0.67. I've looked and looked, but I haven't found the 0.33 D max each eye horizontal requirement anywhere, only the 0.67 TOTAL.
Am I missing something?
AA
PS...I agree that 0.67 in one eye is a sign of poor workmanship, and would question the lab that came from, but for argument's sake I want to know if I'm off base here.
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